Tool for turning crank-pins



(No Model.)

G.'A. JEPFERIS.

TOOL FOR TURNING CRANK PINS.

Patented 001:. 21, 1890.

INVENTOR WITH ESSES upon a collar on the hub.

UNITED STATES PATENT 'OEEIcE.

CHARLES AARON JEFFERIS, OF BIRMINGHAM, ALABAMA.

TOOL FOR TURNING CRANK-PINS.

SPECIFICATION forming part of Letters Patent No. 438,731, dated October 21, 1890.

Application filed May 20, 1890. Serial No. 352,465- (No model.)

To all whom it may concern.-

Be it known that I, CHARLES AARON J EF- FERIS, a citizen of the United States, residing at Birmingham, in the county of Jefferson and State of Alabama, have'invented certain new and useful Improvements in Tools for Turning Crank-Pins; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of this specification.

My invention relates to machines for turning wrist-pins and crank-pins; and it consists in certain combinations of parts whereby I produce a portable appliance for this purpose simple in construction and accurate in operation. While my appliance is adapted to true up pins of any kind, yet itis intended especially for the crank-pins on locomotives using solid end rods. These pins are set into the hub of the wheel without any collar at the joint, since the bearing in the main rod runs close to the hub. It is therefore impossible to true up these pi'ns with any of the machines that are designed to be clamped The end of the pin in these engines is provided with a short threaded stud centrally arranged for the re ception of the washer and nuts that retain the end of the side rod in place upon the pin. My machine is designed to be attached to, held, and centered solely by this stud,as will be described.

In the drawings, Figure 1 is a side elevationof my machine secured upon a crank-pin. Fig. 2 is a section of certain parts. Fig. 3 is an end view.

'The crank-pin A is provided with two bearings a a, and projecting centrally from its outer end is the threaded stud a on which are received the washer and nuts that hold the side rod in place.

My machine is supported by a screw-threaded stem B, which is provided at one end with a squared head I) for the reception of awrench and at the other end is bored out and internally threaded, as shown at b, the threads being formed to fit the stud a An internally-threaded sleeve 0 is screwed upon the stem B,having at one end a collar 0, in which are formed sockets o for a spanner when it desired to run the sleeve along the stem. The exterior of the sleeve at the other end is threaded; but between these threads and the collar it is smooth and cylindrical. Acutterhead D is mounted to turn easily on the sleeve, and is retained in place by a nut C, screwed upon the sleeve 0. The head has two or more arms cl extending parallelwith the stem 13 at a sufficient distance from it to permit them to pass over the crank-pin. In each arm is one or more holes for a cutting or turning tool D, which may be secured by a set-screw d. The head is provided with a polygonal neck 61 upon which is received the socket of a wrench or crank-handle E. A dowel-pin 6 may be passed through a hole in the crank-handle into the head D. A setscrew d enables the head to be clamped to the sleeve when necessary.

The operation of my machine is as follows: The stem having been screwed upon the stud a the tools D are adjusted to take the proper cut and the set-screw d is screwed in to lock the head to the sleeve 0. The handle is then revolved and the tool or tools begin to act upon one or both bearings, as the case may be, the sleeve 0 turning with the head and slowly feeding the head along the stem. In this way the tools are caused to traverse the entire length of the bearings, the operation being repeated, if necessary, until the pin has been rendered truly cylindrical. The fillets can be touched up by releasing the setscrew d and giving the necessary feed to the sleeve by a spanner engaging with the sockets c. It will be seen that the bearings of the crank-pin when turned up will be concentric with the stud a Hy machine is portable and simple and can be used upon the road or at any place, thus obvlating the necessity of taking the locomotive into the shop if circumstances require.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination, with the threaded stem Too B, having a hollow end internally threaded, arms (I and set-screw (Z and a handle E, to of the threaded sleeve C,'having a cylindrical adapted to be attached to-the head, substanexterior portion, a head D, mounted on said tially as described. cylindrical portion and having arms d for the In testimony whereof I affix my signature in 5 tools, and a handle E, for revolving the head, presence of two witnesses.

substantially as described. CHARLES AARON J EFFERIS.

2. The combination, with the stem B, of the Witnesses: sleeve 0, having collar 0, provided with SAMUEL BULLEN,

sockets c, the nut C, the head D, havingthe J. F. MURPHY. 

